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  Subjects -> CHEMISTRY (Total: 836 journals)
    - ANALYTICAL CHEMISTRY (47 journals)
    - CHEMISTRY (586 journals)
    - CRYSTALLOGRAPHY (22 journals)
    - ELECTROCHEMISTRY (26 journals)
    - INORGANIC CHEMISTRY (41 journals)
    - ORGANIC CHEMISTRY (46 journals)
    - PHYSICAL CHEMISTRY (68 journals)

ANALYTICAL CHEMISTRY (47 journals)

Accounts of Chemical Research     Full-text available via subscription   (Followers: 115)
Acta Analytica     Hybrid Journal   (Followers: 7)
Advances in Analytical Chemistry     Open Access   (Followers: 20)
American Journal of Analytical Chemistry     Open Access   (Followers: 28)
Analytica Chimica Acta     Hybrid Journal   (Followers: 33)
Analytical and Bioanalytical Chemistry     Hybrid Journal   (Followers: 29)
Analytical Chemistry     Full-text available via subscription   (Followers: 209)
Analytical Chemistry Insights     Open Access   (Followers: 17)
Analytical Chemistry Research     Open Access  
Analytical Letters     Hybrid Journal   (Followers: 10)
Analytical Spectroscopy Library     Full-text available via subscription   (Followers: 10)
Annual Review of Analytical Chemistry     Full-text available via subscription   (Followers: 9)
Biomonitoring     Open Access  
Chinese Journal of Analytical Chemistry     Full-text available via subscription   (Followers: 3)
Combinatorial Chemistry - an Online Journal     Open Access   (Followers: 2)
Comprehensive Analytical Chemistry     Full-text available via subscription   (Followers: 5)
Critical Reviews in Analytical Chemistry     Hybrid Journal   (Followers: 24)
Current Analytical Chemistry     Hybrid Journal   (Followers: 6)
Drug Testing and Analysis     Hybrid Journal   (Followers: 5)
Electroanalysis     Hybrid Journal   (Followers: 5)
Field Analytical Chemistry and Technology     Hybrid Journal   (Followers: 5)
Handbook of Analytical Separations     Full-text available via subscription   (Followers: 1)
Handbook of Thermal Analysis and Calorimetry     Full-text available via subscription  
International Journal of Analytical Chemistry     Open Access   (Followers: 21)
International Journal of Chemical and Analytical Science     Full-text available via subscription   (Followers: 4)
International Journal of Environmental Analytical Chemistry     Hybrid Journal   (Followers: 6)
International Journal of Polymer Analysis and Characterization     Hybrid Journal   (Followers: 5)
Journal of Analytical & Bioanalytical Techniques     Open Access   (Followers: 5)
Journal of Analytical Atomic Spectrometry     Full-text available via subscription   (Followers: 10)
Journal of Analytical Chemistry     Hybrid Journal   (Followers: 16)
Journal of Electroanalytical Chemistry     Hybrid Journal   (Followers: 4)
Journal of Essential Oil Research     Hybrid Journal   (Followers: 4)
Journal of Radioanalytical and Nuclear Chemistry     Hybrid Journal   (Followers: 4)
Journal of Thermal Analysis and Calorimetry     Hybrid Journal   (Followers: 19)
Main Group Metal Chemistry     Hybrid Journal   (Followers: 1)
Microchemical Journal     Hybrid Journal   (Followers: 3)
Nigerian Journal of Chemical Research     Full-text available via subscription  
Phytochemical Analysis     Hybrid Journal   (Followers: 2)
Polish Journal of Chemical Technology     Open Access   (Followers: 1)
Reviews in Analytical Chemistry     Hybrid Journal   (Followers: 7)
Sample Preparation     Open Access  
Surface and Interface Analysis     Hybrid Journal   (Followers: 14)
Techniques and Instrumentation in Analytical Chemistry     Full-text available via subscription   (Followers: 6)
TrAC Trends in Analytical Chemistry     Full-text available via subscription   (Followers: 20)
Trends in Environmental Analytical Chemistry     Hybrid Journal   (Followers: 1)
Vibrational Spectroscopy     Hybrid Journal   (Followers: 8)
World Journal of Analytical Chemistry     Open Access  
Journal Cover   Journal of Analytical Chemistry
  [SJR: 0.33]   [H-I: 19]   [16 followers]  Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 1608-3199 - ISSN (Online) 1061-9348
   Published by Springer-Verlag Homepage  [2291 journals]
  • Spectrophotometric determination of purine alkaloids by flow injection and
           sequential injection analysis
    • Abstract: Abstract Procedures are developed for the flow-injection and sequential-injection determination of purine (xanthine) alkaloids (caffeine, theophylline, theobromine, and aminophylline) based on their spectrophoto-metric detection by the oxidative coupling reaction with 3-methyl-2-benzothiazolinone hydrazone hydrochloride under the action of potassium periodate in a weakly acidic aqueous medium (pH 5–6). The analytical range is 3–500 μg/mL, and throughput is 120–180 h–1. It is demonstrated that the developed procedures can be used for the quality control of pharmaceutical preparations.
      PubDate: 2015-08-01
       
  • Liquid chromatography-tandem mass spectrometry determination of the
           degradation products of V-type nerve agnents,
           N,N-dialkylaminoethanesulfonic acids
    • Abstract: Abstract Degradation products of V-type nerve agents are important markers of these toxic chemical warfare agents, hence their detection and identification is of high importance from verification point of view of Chemical Weapons Convention (CWC). We focused on detailed investigation of fragmentation of N, N-dialkylaminoethanesulfonic acids, degradation products of V-type nerve agents using liquid chromatography-tandem mass spectrometry (LC−MS/MS), a LCQ Deca XP max ion trap mass spectrometer via an electrospray ionization in ESI mode. Capillary and tube lens voltages were optimized to give maximum response to m/z 210 [M + H]+ ion of N,N-diisopropylaminoethanesulfonic acid. The main fragmentation pathways are loss of alkyl groups attached to the nitrogen atoms. Within the aims of CWC, LC−ESI-MSn represents an important tool to control the production of prohibited compounds among others due to a possibility of easy monitoring of their content in environmental matrices. The knowledge of the fragmentation pathway will be useful for the unambiguous identification of degradation products of V-type nerve agents in human urine matrices as well as environmental matrices in the Organization for the Prohibition of Chemical Weapons proficiency test.
      PubDate: 2015-08-01
       
  • HPLC of anthocyans with an amperometric detector: Evaluation of the
           antioxidant activity
    • Abstract: Abstract Anthocyan complexes of a series of grape varieties with the composition traditional for Vitis vinifera, containing 3-glucosides of five anthocyanidins, delphinidin (Dp3G), cyanidin (Cy3G), petunidin (Pt3G), peonidin (Pn3G), and malvidin (Mv3G) as the major components have been studied by reversed-phase HPLC with diode-array, mass spectrometric, and amperometric detectors. A procedure has been developed for the determination of the antioxidant activity of individual anthocyans using an amperometric method; the peculiarities of using a Tsvet Yauza-01-AA system have been evaluated. It has been shown that the sensitivity of amperometric detection depends not only on the structure of anthocyans, but also on the anode voltage. A scheme of the calculation of the antioxidant activity of anthocyan complexes by the results of amperometric detection of a mixture of individual anthocyans has been proposed.
      PubDate: 2015-08-01
       
  • Determination of titanium(IV) and chromium(VI) with
           2,7-dichlorochromotropic acid and 1,5-diphenylcarbazide on the solid phase
           
    • Abstract: Abstract Possibility of the selective determination of Ti(IV) and Cr(VI) by diffuse reflection spectroscopy after their simultaneous adsorption from one sample on a two-layer substrate is studied. Titanium(IV) is adsorbed on a fiber filled with a cation exchanger (PANV-KU-2) and determined with 2,7-dichlorochromo-tropic acid; chromium(VI) is adsorbed on a fiber filled with an anion exchanger (PANV-AV-17) and determined with 1,5-diphenylcarbazide. Conditions are selected for the simultaneous adsorption of titanium and chromium in the batch and dynamic modes. Conditions are optimized for the determination of titanium with 2,7-dichlorochromotropic acid on PANV-KU-2. The selectivity of titanium and chromium determination in the presence of foreign ions is studied. Calibration graphs are linear in the ranges 5–40 and 2–20 ng/mL for Ti(IV) and Cr(VI), respectively; the detection limits are 4 and 2 ng/mL. The possibility of determining Ti(IV) and Cr(VI) in one sample at their ratios from 5: 1 to 1: 4 is shown.
      PubDate: 2015-08-01
       
  • Development and validation of RP-HPLC method for simultaneous estimation
           of rifampicin, isoniazid and pyrazinamide in human plasma
    • Abstract: Abstract A rapid, simple, sensitive and cost effective stability indicating high performance liquid chromatographic method for the simultaneous determination of rifampicin, isoniazid and pyrazinamide in human plasma was developed and validated in accordance to Food and Drug Administration (FDA) guidelines. The three drugs were eluted under isocratic mode using a 250 × 4.0 mm i.d., 5 μm Phenomenex ODS 2 C18 column. The mobile phase was composed of a mixture of acetonitrile, methanol and water in the ratio of 30: 5: 65 (v/v, pH adjusted to 5.2) at a flow rate of 1.0 mL/min. The limits of detection and quantification for rifampicin were 0.13 and 0.4 μg/mL, for isoniazid—0.6 and 1.8 μg/mL; and for pyrazinamide—0.5 and 1.6 μg/mL, respectively. The method can be successfully applied for pharmacokinetic, bioavailability or bioequivalence studies of rifampicin, isoniazid and pyrazinamide combination in human subjects.
      PubDate: 2015-08-01
       
  • Quantification of biodiesel in biodiesel-diesel blends using
           spectrofluorimetry and multivariate calibration
    • Abstract: Abstract With the aim to increase the percentage of biofuel in Brazil’s energy assets, biodiesel has been compulsorily added to regular diesel oil since January 2008, currently at a concentration of 5% (v/v). The method used to quantify the biodiesel in biodiesel−diesel blends has limitations with respect to their sensitivity to contaminants containing carbonyl groups. In this context, the objective was to develop a simple analytical and low cost method for the quantification of biodiesel in biodiesel−diesel blends combining multivariate calibration to spectrofluorimetry. The proposed method provided the determination of biodiesel in the range of 0.4 to 19.0% (v/v) with prediction errors less than 0.35% (v/v) using synchronized spectrofluorimetry and partial least squares. In the range of 4.5 to 20.0% (v/v) the average relative error was less than 4%. The method is simple, fast, requires no pre-treatment of samples and can be performed on site, featuring low cost and good accuracy.
      PubDate: 2015-08-01
       
  • Transformations of Tetrahydrocannabinol, tetrahydrocannabinolic acid and
           cannabinol during their extraction from Cannabis sativa L.
    • Abstract: Abstract The presented study discusses the difference in the results of estimation of Δ9-tetrahydrocannabinol (THC), tetrahydrocannabinolic acid (THCA) and cannabinol (CBN) amount in Cannabis sativa L., using long-lasting liquid extraction in the Soxhlet apparatus and pressurized liquid extraction (PLE) as sample preparation methods in the analytical procedure. THC amounts extracted in the PLE process using nhexane or methanol are very similar. THCA amounts extracted in the PLE process using n-hexane are generally greater than those extracted in the Soxhlet apparatus but smaller when methanol is applied in the PLE process. The obtained results evidently show that the mutual transformations of THCA, THC and CBN occur not only during Soxhlet extraction but also during short-lasting PLE. In the last case, however, they are small. The intensity of the transformation depends on the applied extractant type.
      PubDate: 2015-08-01
       
  • Pb 2+ ion induced self assembly of anthracene based chalcone with a
           fluorescence turn on process in aqueous media
    • Abstract: Abstract A simple anthracene based chalcone as a fluorescent chemosensor, capable of detecting Pb2+ in aqueous media, has been synthesized by the reaction between benzaldehyde and 9-acetyl anthracene. The Pb2+ recognition process follows a photo-induced electron transfer mechanism and is scarcely influenced by other coexisting metal ions. Determination of lead in a variety of water samples was performed.
      PubDate: 2015-08-01
       
  • Assessment of the antioxidant properties of micellar spice extracts by
           
    • Abstract: Abstract The stoichiometric coefficients of reactions of individual antioxidants of spices—rutin; quercetin; eugenol; curcumin; capsaicin; thymol; tannin; catechol; and gallic, p-coumaric, caffeic, chlorogenic, and rosmarinic acids—with electrogenerated hexacyanoferrate(III) ions in a Triton X100 micellar medium are determined; the corresponding reaction schemes are proposed. It is found that the maximum recovery of active components from spices is achieved at a single extraction with a 0.25 mM Triton X100 solution for 10 min upon sonication. The raw material: extractant ratio is 1: 30 for all spices except for caraway, red sweet pepper, and nutmeg (1: 40) and cumin and red pepper (1: 20). The ferric reducing power (FRP) of micellar extracts of 16 spices is evaluated. It is found that the highest FRP is characteristic for cinnamon and clove (122 ± 4 and 106 ± 6 C/g, respectively), while the lowest value of this parameter is typical for cumin and turmeric (3.3 ± 0.3 and 2.5 ± 0.3 C/g, respectively), which is because of the nature of the active components of spices and the extractant. The FRP of spices correlates with their antiradical activity and the total phenolic content with r = 0.9714 and 0.9936, respectively.
      PubDate: 2015-08-01
       
  • Study of the processes of background formation in the long-wavelength
           region of X-Ray spectrum
    • Abstract: Abstract Using mathematical design of experiments we studied the spectral composition of an X-ray background in the wavelength region 0.3–1.2 nm in the X-ray fluorescence analysis (XRF) of samples with matrices composed of elements with small atomic numbers, viz plant materials. The interpretation of the results allowed us to quantitatively estimate components of X-ray background for spectrometers with wavelength dispersion and to reveal their dependence on the chemical composition of the specimens. Recommendations are formulated for the account of the background in the plant XRF.
      PubDate: 2015-08-01
       
  • A microfluidic chip for the determination of polyphenolic antioxidants
    • Abstract: Abstract A microfluidic system of capillary electrophoresis with electrochemical detection is developed. The process of manufacturing a chip based on polydimethylsiloxane and glass for the determination of electroactive compounds is described. We studied the possibilities of the treatment of the chip channel surface in a gas discharge with sodium dodecyl sulfate, sodium deoxycholate, and an ionic liquid of 1-dodecyl-3-trimethylimidazolium chloride, used as additives to the background electrolyte. It was found that the developed microfluidic system can be used for the determination of polyphenolic antioxidants in green tea and red wine.
      PubDate: 2015-08-01
       
  • Use of composite films based on poly(3,4-ethylenedioxythiophene) with
           inclusions of palladium nanoparticles in voltammetric sensors for hydrogen
           peroxide
    • Abstract: Abstract Possibilities of using new electrode materials PEDOT/Pd and PEDOT:PSS/Pd (where PEDOT is poly(3,4-ethylenedioxythiophene) and PEDOT:PSS is poly(3,4-ethylenedioxythiophene)/polystyrene sulfonate) prepared by the chemical deposition of ultradispersed Pd particles into a polymer matrix as sensor materials for the determination of H2O2 are considered. The structure of films is characterized by electron microscopy and energy dispersive X-ray fluorescence analysis. The voltammetric responses of PEDOT/Pd and PEDOT:PSS/Pd films in solutions containing H2O2 are studied. The conditions of the voltammetric determination of H2O2 on modified metal–polymer electrodes are optimized.
      PubDate: 2015-08-01
       
  • Identification and determination of polysulfonic and polycarboxylic acid
           oligomers in construction materials using matrix-assisted laser
           desorption/ionization mass spectrometry
    • Abstract: Abstract Methods for the identification of polymethylene naphtalene sulfonates (PMNS) and polycarboxylate ethers and the determination of PMNS in finished construction materials based on Portland cement using matrix-assisted laser desorption/ionization mass spectrometry (MALDI MS) are proposed. Modifiers were extracted from construction materials using a mixture of water with acetonitrile. The analytical range for PMNS was 0.3–0.9% of dry substance in relation to the cement weight. The relative standard deviation of the results of PMNS determination in concrete did not exceed 10%. The time of analysis was 40–50 min.
      PubDate: 2015-08-01
       
  • Contemporary trends in the development of immunochemical methods for
           medical analysis
    • Abstract: Abstract The review is dedicated to contemporary trends in the development of immunochemical methods, the position of these methods in clinical analysis, and the applications of these methods. The tendencies toward miniaturization and the simultaneous determination of several analytes are considered. The prospects of applying nanosized markers, the requirements imposed on them, and limitations are discussed in detail. Predictions of the subsequent development of immunochemical methods in the area of clinical analysis are made.
      PubDate: 2015-08-01
       
  • Development and validation of thin layer chromatography method for
           simultaneous determination of seven chlorophenoxy and benzoic acid
           herbicides in water
    • Abstract: Abstract Thin layer chromatography (TLC) densitometric method for simultaneous determination of seven chlorophenoxy and benzoic acid herbicides (2,4-D; 2,4,5-T; MCPA; 2,4-DP; MCPP; Dicamba and MCPB) in water samples was developed and validated. A mobile phase consisted of benzene−dioxane−glacial acetic acid in ratio of 45: 10: 2 and TLC silica gel 60 F254 aluminium plate were used. Detection was carried out densitometrically at 280 nm. The linearity was obtained in the range 20–200 ng per band with the correlation coefficient between the peak area and concentration for each analyte higher than 0.9976. The limits of detection and quantification were 18 and 60 ng per band, respectively. The recoveries of analyzed herbicides varied from 84.5 to 92.7%. The method can be used for routine quality analysis of chlorophenoxy and benzoic acid herbicides in natural surface and ground water samples.
      PubDate: 2015-08-01
       
  • Determination of the major metabolite of betahistine (2-pyridyl acetic
           acid) in human plasma by high performance liquid chromatography-tandem
           mass spectrometry
    • Abstract: Abstract A specific HPLC−MS/MS assay was developed for the determination of the major metabolite of betahistine (2-pyridyl acetic acid) in plasma. The analyte was extracted from plasma by solid phase extraction technique. 3-Pyridyl acetic acid-d6 was used as the internal standard. Samples were applied to a Waters 515 HPLC system to deliver a mobile phase composed of a mixture of deionized water and acetonitrile in a ratio of 90: 10, (v/v) plus 0.2% formic acid. 2-Pyridyl acetic acid was monitored at the molecular ion m/z 137.818 and MS/MS (daughter) at m/z 91.998. 3-Pyridyl acetic acid-d6 was monitored at the molecular ion m/z 144.320 and MS/MS (daughter) at m/z 99.100. The separation was performed at 40°C. The analytical method was validated according to the Guidance for industry, Bioanalytical Method Validation, Food and Drug Administration (FDA). The results met the acceptance criteria as stated in the aforementioned guidance. The method was proved to be sensitive and specific. Linearity was established for the range of concentrations 2.5–600 ng/mL with a correlation coefficient (R) not less than 0.994. The lower limit of quantification (LLOQ) was identifiable and reproducible at 2.5 ng/mL with a precision of 3.6% of the coefficient of variation (CV). Long-term stability of 2-pyridyl acetic acid in plasma samples was investigated for a period beyond that needed for finalizing authentic (subject) samples analysis. Stability in the autosampler and at bench top was also established.
      PubDate: 2015-08-01
       
  • Hyperbranched polymers based on polyethyleneimine with terminal
           oligosaccharide groups as new chiral selectors in high-performance
           thin-layer chromatography
    • Abstract: Abstract It is demonstrated that hyperbranched polymers (HBP) of a “core–shell” type based on polyethyleneimine with terminal oligosaccharide groups (maltose, lactose, and maltotriose) can be used as chiral selectors in the separation of enantiomers of nonsteroidal anti-inflammatory preparations and β-blockers by high-performance thin-layer chromatography. The dependence of enantioselectivity factors on the structure, concentration, and nature of terminal groups in HBP is studied. It is shown that HBP offer high enantioselectivity factors, exceeding the corresponding values for another chiral selector, β-cyclodextrin, by four to five times.
      PubDate: 2015-08-01
       
  • Extraction–photometric determination of vanadium in natural waters
    • Abstract: Abstract The procedure for the extraction–photometric determination of vanadium from N-benzoyl-N-phenylhydroxylamine (N-BPHA) is improved for the analysis of natural waters. The dependence of the absorbance of extracts on the concentration of vanadium(V) in aqueous solution is linear in the range of 0–1500 μg/L and can be described by the equation A = (10.70 ± 0.02) × 10–4 c V (μg/L). The molar absorption coefficient of the complex in chloroform is 5450 ±10 and its partition coefficient between the phases is equal to 26.1 ± 0.5. It is shown that vanadium in natural waters occurs in the free and bound forms. The prevailing anionic forms of vanadium(V) are, probably, free and the cationic species of vanadium(IV) are bound with organic components of natural waters. For the decomposition of the last named compounds, the authors recommend the oxidative digestion of samples by boiling with 1 mL conc. HClO4 to the appearance of fumes.
      PubDate: 2015-08-01
       
  • A highly sensitive spectrophotometric determination of sodium
           2-sulfanylethanesulfonate in pharmaceutical preparations
    • Abstract: Abstract The aim of this research was to develop a new sensitive and simple spectrophotometric method for the determination of sodium 2-sulfanylethanesulfonate (SSES) with leucocrystal violet. The procedure is based on a redox reaction occurring between the SSES and potassium iodate in an acidic medium. Formed in stoichiometric quantity iodine oxidizes leucocrystal violet to the crystal violet dye, whose coloring is a base of the spectrophotometric measurements. The crystal violet dye formed shows maximum and stable absorbance at pH = 4.1 ± 0.1 and λ = 590 nm. The molar absorptivity, limit of detection and limit of determination of the method were calculated to be 6.98 × 104 L/mol cm, 0.10 and 0.13 μg/mL, respectively. The color system obeys Beer’s law in the range 0.2–2.0 μg/mL of SSES. The optimum analytical conditions were evaluated. The proposed method has been successfully applied to the determination of SSES in pharmaceutical preparations, without the need of any complicated instrumentation. Reliability of determination was confirmed applying standard iodometric method, recommended by European and Polish Pharmacopoeia.
      PubDate: 2015-07-01
       
  • An oxalate-selective electrode and its application to analysis
    • Abstract: Abstract It is shown that the improvement of the steric accessibility of exchange centers of higher quaternary ammonium salts by replacing three long-chain radicals (octadecyl) with three methyl radicals and the addition of a neutral carrier, p-trifluoroacetylbenzoic acid heptyl ester, significantly enhance the selectivity of an oxalate-selective electrode and lower the detection limit. An electrode reversible to oxalate ions is proposed. A procedure is developed for determining oxalate ions in green and black tea.
      PubDate: 2015-07-01
       
 
 
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